535 citations · 1.9k across the 18 of their papers we have counts for
18 papers
Ising Dirac fermions across a topological phase transition
Aoqian Zhang, Yaqi Ma, Yifei Jin +14
Dirac fermions have attracted significant interest due to their relativistic dispersions and close connections to topological physics, yet they are generally expected to be gapped…
Observation of a Mott quantum spin Hall insulator in twisted WSe2
Yifei Jin, Yaqi Ma, Aoqian Zhang +9
Quantum spin Hall (QSH) insulators and Mott insulators are conventionally regarded as distinct insulating phases, arising from band topology and strong Coulomb interactions, respec…
Time-reversal symmetry breaking fractional quantum spin Hall insulator in moiré MoTe2
Kaifei Kang, Yichen Qiu, Bowen Shen +7
Twisted bilayer transition metal dichalcogenide semiconductors, which support flat Chern bands with enhanced interaction effects, realize a platform for fractional Chern insulators…
Observation of the fractional quantum spin Hall effect in moiré MoTe2
Kaifei Kang, Bowen Shen, Yichen Qiu +4
Quantum spin Hall (QSH) insulators are two-dimensional electronic materials that have a bulk band gap like an ordinary insulator but have topologically protected pairs of edge mode…
Observation of the double quantum spin Hall phase in moiré WSe2
Kaifei Kang, Yichen Qiu, Kenji Watanabe +3
Quantum spin Hall (QSH) insulators are a topologically protected phase of matter in two dimensions that can support non-dissipative spin transport. A hallmark of the phase is a pai…
Integer and fractional Chern insulators in twisted bilayer MoTe2
Yihang Zeng, Zhengchao Xia, Kaifei Kang +7
Chern insulators, which are the lattice analogs of the quantum Hall states, can potentially manifest high-temperature topological orders at zero magnetic field to enable next-gener…
Quantum Transport in Graphene Using Surface Acoustic Wave Resonators
Yawen Fang, Yang Xu, Kaifei Kang +7
Surface acoustic waves (SAWs) provide a contactless method for measuring the wavevector-dependent conductivity. This technique has been used to discover emergent length scales in t…
Gate-tunable heavy fermions in a moiré Kondo lattice
Wenjin Zhao, Bowen Shen, Zui Tao +6
The Kondo lattice, describing a matrix of local magnetic moments coupled via spin-exchange interactions to itinerant conduction electrons, is a prototype of strongly correlated qua…
Switchable moiré potentials in ferroelectric WTe2/WSe2 superlattices
Kaifei Kang, Wenjin Zhao, Yihang Zeng +4
Moiré materials, with superlattice periodicity many times the atomic length scale, have enabled the studies of strong electronic correlations and band topology with unprecedented t…
Realization of the Haldane Chern insulator in a moiré lattice
Wenjin Zhao, Kaifei Kang, Lizhong Li +7
The Chern insulator displays a quantized Hall effect without Landau levels. In a landmark paper in 1988, Haldane showed that a Chern insulator could be realized through complex nex…
Tunable bilayer Hubbard model physics in twisted WSe2
Yang Xu, Kaifei Kang, Kenji Watanabe +3
Moiré materials with flat electronic bands provide a highly controllable quantum system for studies of strong-correlation physics and topology. In particular, angle-aligned heterob…
Van der Waals pi Josephson junctions
Kaifei Kang, Helmuth Berger, Kenji Watanabe +4
Proximity-induced superconductivity in a ferromagnet can induce Cooper pairs with a finite center-of-mass momentum. The resultant spatially modulated superconducting order paramete…
Continuous Mott transition in semiconductor moiré superlattices
Tingxin Li, Shengwei Jiang, Lizhong Li +9
The evolution of a Landau Fermi liquid into a nonmagnetic Mott insulator with increasing electronic interactions is one of the most puzzling quantum phase transitions in physics. T…
Giant anisotropic magnetoresistance in Ising superconductor-magnetic insulator tunnel junctions
Kaifei Kang, Shengwei Jiang, Helmuth Berger +5
Superconductivity and magnetism are generally incompatible because of the opposing requirement on electron spin alignment. When combined, they produce a multitude of fascinating ph…
Imaging and control of critical spin fluctuations in two-dimensional magnets
Chenhao Jin, Zui Tao, Kaifei Kang +4
Strong spin fluctuations are expected near the thermodynamic critical point of a continuous magnetic phase transition. Such critical spin fluctuations are highly correlated and in…
An unusual continuous paramagnetic-limited superconducting phase transition in 2D NbSe
Egon Sohn, Xiaoxiang Xi, Wen-Yu He +9
Time reversal and spatial inversion are two key symmetries for conventional Bardeen-Cooper-Schrieffer (BCS) superconductivity. Breaking inversion symmetry can lead to mixed-parity…
Observation of the nonlinear anomalous Hall effect in 2D WTe2
Kaifei Kang, Tingxin Li, Egon Sohn +2
The Hall effect occurs only in systems with broken time-reversal symmetry, such as solids under an external magnetic field in the ordinary Hall effect and magnetic materials in the…
Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field
Chuan Zhao, Tenzin Norden, Puqin Zhao +14
Exploiting the valley degree of freedom to store and manipulate information provides a novel paradigm for future electronics. A monolayer transition metal dichalcogenide (TMDC) wit…